Carburetor



Oct. 1s, 1927. 1,645,945

A. DICKERSON GARBURETOR Filed Jan. 6, 1925 2 Sheets-Sheet 1 Oct. 189

A. DlcKlzRsoN y K GARBURETOR Filed Jan. e, -1925 2 sheets-sheet 2 Patented Oct. 1,8, 1927.

UNITED STATESv ARTHUR DrCKiiiisoN, or sALT LAKE GITY, UTAH,V Assreivoa To nrcKEasoN CARBU- i :RETOR COMPANY, A coaroaATIoN "or UTAH.

CARBURETOR.

Application iled January 6, 1925. Serial No. 895;

My invention relates to carburetors for internal combustion engines, and has tor its object to provide a new and improved carburetor whereby av limited amount cf carbu-r retted gas may be supplied to theengine, and automatically increased in volume.

These objects I accomplish with the device illustrated in the accompanying drawings in` which similar letters and numerals of reference indicate like parts Vthroughout the several views, and as described in the specilication forming a part of this application and pointed outfin the appended claims.

In the drawings in which I have shown` the best mannerot1 applying the principles of my invention, Figure .l is a. side elevation of the device. Figure Q is a vertical section on line 2-2 of Figure 3. Figure 3 is a plan view of the device. Figure fl is a-plan view of the closure plate ot' the iioat chamber and the valve support. Figure 5' is a horizontal cross-section of the device, on line 5-5 of Figure 2. n

My invention consists of a fuel-chamber .casing A, having a closure plate B secured thereon by the tap screws 1. On the top of saidclosure platejB is secured a casing R.

part ot' which'forms the mixing chamber D which is secured to the intake'manifold of the engine. The interior of said casing A is hollowed out as a loatchamberv C with a wing recessf2 opening to said chamber lVithin said chamber-C and recess 2 is eccentrically pivoted the counter weighted displacement member E which takes thek place of the commonly used float, and is raised or lowered by the amount of gasoline in the said chamber C. A priming bowl F is centrally formed on the 'said closure plate B, and concentrically in said bowl F the valve casing G- is vertically secured, and which is connected with the interior of said lioat chamber C by the port 3, through which the fuel, such as gasoline, is'introduced into theV riininOf bowl and mixing chamber. .The

uel supply pipe 4: is screwed into the upper K is suppliedforpriming thedevice. and when idling the engine. A valve stein H is screwed `exit ports 7.

into the upper portion ofsaid casing G, with4 its medial portions spaced 'from the .interior of said'casing, and its lower endclosely iit-k ted within said casing to close said port 6 when the stem is moved longitudinally; In the side wall of said vcasing G are also provided spaced apart exit ports 7, through whichthe gasoline passes into the mixing chamber D. An air inlet 8 is bored through the upper portion of said valve stem H and a fuel port`9 is provided through itslower end portion to allow gasoline to pass to said Then the valve stein is inserted inthe casing Gr a fuel well Sais formed in the bottoni of the said casingk 'G and the amount of fuel therein is regulated by the amount of iuel in the float chamber A as it is directly connected therewith by the port 8. IVithin-the interior of said mixing chamber D is provided an eccentrically mounted butterfly choke valve 10,'and the throttle valve 1l, and more centrally in said Y chamberD I provide a constricted throat in which I provide two Hap valves l2, of

dii-ferentweights,which regulate the iiow of the main air supply to the mixing side of thel device, as they are operated by the suction of the engine. eccentrically mounted on the shaft 10a, which is )pivoted in the walls of the casingD and a lever arm 10b is secured to the free end of the said shaft. i The said flap valves 12 are referably of the samef'supercial area, but,

y making one, of Athem thicker, or ofheavier metal,the lighter of` thetwo'will be moved first, as whenthe `air rcurrent is not so strong, and when, by driving the engine faster, 'the'. air current becomes stronger the heavier of thesa'id v alves 1,2 will .bemoved on their common pivot and air will pass bothv valves.

lI use` said valves'to overcome the pulsative movements ofl the choke valves@ The said valves seat in a restricted throator. narrow yplace provided in the said mix-ing chamber D. The said choke valve 10 may be manually operated` as hereafter described, or it may he operated by the suction ofthe engine pistons, and said choke valve is notv connect-f ed with said flap valves l2, but movesy independently of them. A needle valve 13 is provided in the upper end of the said valve stem H, by which air is allowed to enter said casing G to prevent excess vacuum action on the supply of gasoline in said casing. A lever 141 of the bell crank type is secured von 'lll The said choke valve l0 is the gasoline.

the upper end of said valve -stem H, by which the said stem is partially rotated and moved longitudinally when said lever is operated. The said leverrll is also connected with said cholzevalve 10 by the compensating spring' 16. A jam nut`15 is screwed' on the upper end portion of said casing Gr to fasten the mixing` chamber D to the said vclo- Sure plate B and/float casing'A. Theeompensating springl is secured at one end to saidgbell crank lever liandatits other end tosaid choke valve -lever arm 10b -to allow movementof said choke valve independently of thelever lgwhen actuated by the euction v.of air through the mixing` chamber D.

`Whenethe choke lever 14de-moved clockwise the port 6 is openedgand when the said lever is rotated geounter clockwise the said port 26 is`icl-sed.v AWhen thesaid'lever 1e Sis-moved the `spring` 16 ,'pulls Vthe-lever ar-fm 10b-and opensv the butterfly valve'lO accordingly-.and the said vbutterfly valve fis closed 'when the lever ll'isiturnedcounter clockwise. vifi/*hen the'cholre Valve 1,0 Yland vvalve stem H are thenprimingbowl Fandzdrawn t'hroughthe port 18 into the-mixing chamber iD by .the suction' ofthe-engine. Then the :valvefste-m His I'rotated :a Ifull .turn the portV 6 is 5fully opened and Jallof the ports are-always open gasoline willgpassthrou'gh them into the 'mixing chamber D with the required amount of Iairas ,passed bythe `chokev valve 10 due-tothe 'snctionrofnthe engine. 'lilith thev engine running` the lrequired amountvof aiir will be drawn 1 at allI ltimee :past `the choke valve 10, thetlap valvesl-Q, Vand-mixed with Kp The said'epring llnormally holds't-he Said-choke valve y"10 closed, and

acts againstthe movement ofsa/id-lev'er glei.

Anair gport 17 is;provided-in said closure plate B,through-which air 'is'drawrn into said priming vbowl Fyandanother port L18 fis provided yfinjsaid ':losurep'late B through which amixture of'airandgasoline is drawn into the mixingchamber D. Theqsaid Sport 18delarger than -the;port 17 to vcreate a tendency of vacuumr in'the lpriming:bowl 1F.

lVhen the engineis idling"I the flap valvesl will vbe closed, and -only the air ypassing through said ports 17 and 18 enters the engine with the required amount .of gasoline which passes throuoh port 6.

Having thus described my invention I desireto secure" by lLetters 'Patentfa'nd claim 1. A;carburetor"comprising a lioat chamber, a cover plate therefor having two air 'ports 'therein of different sizes; a mixing and havingv itsv medial portion spaced fromV said valve casing` `to form -apassage therewith yan air conduit openinginto the lupper end of the said'p'assage, fand a fuel conduit opening into `its lower end to allow passage of fuel therethrough and means-to control the amountiof fuel drawn up thronghsaid' exit ports commensurate with the speed of the'engine.

2. A carburetorcomprising a 'li-oat chamber; a cloture plate therefor; a mixing bowl formed in the upper face of the .closureplate and depending` into said HoetA chamber; Ya casing' secured on veaid'plate. havingr a mix ing .chamber formedl therein, w'hichicliamber has a restricted throat therein; pivoted hap valves 'normally closing said constricted throat and operable by the suctionv of the engine pistons; a valve casing' secured in the bottom of eaidniiX-ing bowl and extending upwardly through said mixing chamber and havingeXit-porte in its :side walls opening;r into thesai'dcasing and oneof which opens into Uthe interior of said mixing` bowl.; a valve stemfoperable in said valve casing 'and adapted to open and close said 'last mentioned port; a bell crank lever to operate said stem; a choke valve eccentrically mounted insaid mixing chamber-and aconr pensatfing spring connecting.saidlever and choke 'valve to allow said choke valve to operate independently of eaid bell crank leverwhjen acted upon by suction.

In testimony whereof IhaYe aiiiXed rmy signature. i

externen nicKnne'oNl., e 

